Obstacle marker



FIG. 1 is a perspective view of an obstacle marker showing my newdesign;

FIG. 2 is a top plan view, the bottom plan view being identical thereto;

FIG. 3 is a typical side elevational view; and,

FIG. 4 is another typical side elevational view thereof.

FIG. 4 has been drawn on a reduced scale with respect to FIGS. 1-3.

The ornamental design for an obstacle marker, as shown.